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A025028 Numbers whose least quadratic nonresidue (A020649) is 23. 10
10559, 15791, 21118, 31582, 50951, 53231, 53881, 88079, 88919, 92569, 97919, 101902, 102001, 106462, 107762, 123191, 128519, 130729, 138311, 142271, 144169, 158759, 166319, 166609, 167879, 173209, 174599, 176158, 176401, 177838, 185138 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Quadratic Nonresidue.
PROG
(PARI) residue(n, m)=local(r); r=0; for(i=1, floor(m/2), if(i^2%m==n, r=1)); r
isA025028(n)=local(a); a=1; forprime(p=2, 19, a=a && residue(p, n)); a=a && !residue(23, n); a \\ Michael B. Porter, Apr 30 2010
(PARI) is(n)=forprime(p=2, 23, if(!issquare(Mod(p, n)), return(p==23))); 0 \\ Charles R Greathouse IV, Jan 24 2020
CROSSREFS
Sequence in context: A065319 A063060 A187727 * A063063 A183600 A302772
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 28 07:48 EDT 2024. Contains 371235 sequences. (Running on oeis4.)